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In the work the effect of alkali metal cations on the electronic system of heterocyclic five-membered heterocyclic acids that possess S, N and O atoms was studied (2-thiophenecarboxylic, 2-furanecarboxylic and 2-pyrrolecarboxylic acids). The experimental (IR, Raman, NMR) and theoretical (in B3LYP/6-311++G∗∗ and MP2/6-311++G∗∗ levels) methods were applied in this study. The studies showed that formation...
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